Re: [netcdfgroup] netCDF-beta and 64-bit Snow Leopard build attempt (failed)

  • To: Ed Hartnett <ed@xxxxxxxxxxxxxxxx>
  • Subject: Re: [netcdfgroup] netCDF-beta and 64-bit Snow Leopard build attempt (failed)
  • From: Larry Baker <baker@xxxxxxxx>
  • Date: Tue, 19 Oct 2010 11:08:52 -0700
The reason I put the -m64 in the CC, CXX, and FC variables is so that - m64 is supplied to any LD step. That way the 64-bit libraries are used at link time. This is necessary on some of the platforms I've used. I think of -m64 as fundamentally selecting a different compiler; it's not really the same as other compile-time flags. 

Larry Baker
US Geological Survey
650-329-5608
baker@xxxxxxxx

On Oct 19, 2010, at 10:35 AM, Ed Hartnett wrote:


Larry Baker <baker@xxxxxxxx> writes:


John,
I have no experience with the version of the library you are trying to 
compile, nor with Snow Leopard yet.  However, my ./configure command
is slightly different than yours, esp. note -DgFortran:

        ./configure >configure.log 2>&1 \
           CC="gcc -m64" \
           CFLAGS="-g -O2" \
           CXX="g++ -m64" \
           CXXFLAGS="-g -O2" \
           CPPFLAGS="-DNDEBUG -DgFortran" \
           FC="gfortran -m64" \
           FCFLAGS="-g -O2"

Larry Baker
US Geological Survey
650-329-5608
baker@xxxxxxxx



#!/bin/bash
make distclean
#
export FCFLAGS='-m64'
export CC=/usr/bin/cc
export F77=gfortran
export FC=gfortran
export FCFLAGS=-qsuffix=cpp=f90
export CPPFLAGS='-Df2cFortran'
#
./configure --prefix=/usr/local/netcdf-4.1.2-beta1 --enable-f90 --
with-curl=/usr/local/lib

Assistance would be very helpful since I don't have a working copy
of GMT on this machine at the moment and need one.
It's a little confusing, but there are *two* sets of Fortran flags, one 
for F77 (FFLAGS) and one for F90+ (FCFLAGS). If you are going to build
64 bit, with GNU compilers, you must use -m64 for BOTH F77 and
F90. Furthermore, you also need to use the same flag for C (and C++ if
you build that).

So a better set of environment vars for your flags would be:

CFLAGS=-m64
FFLAGS=-m64
FCFLAGS=-m64
CXXFLAGS=-m64

Setting CPPFLAGS is tricky, as it depends on your version of
gfortan. It should either be set to -Df2cFortran or (more likely)
-DgFortran. One way to handle this is to try setting neither, and see if 
the netcdf configure script can figure it out.

I hope this answers all the questions!

Thanks,

Ed



--
Ed Hartnett  -- ed@xxxxxxxxxxxxxxxx